Slipper lobsters are a unique group of decapod crustaceans; they have cylindrical or flattened
bodies and belong to the family Scyllaridae. The genus Ibacus (Leach, 1815) (Achelata,
Scyllaridae, Ibacinae) consists of eight recognized species to date, all of which occur in the Indo-
West Pacific Ocean and are commercially important seafood species. The complete mitochondrial
genome of the Japanese fan lobster Ibacus ciliatus (Von Siebold, 1824) is 15,696 bp in size
and consists of 13 protein-coding genes, 22 transfer RNAs, 2 ribosomal RNAs, and a control
region of 783 bp. The base composition of I. ciliatus is 35.8% A, 34.7% T, 19.0% C, and 10.5% G,
with an overall AT content of 70.5%. The mitogenome of I. ciliatus was found to have gene
arrangement and transcriptional polarity identical to that of the American lobster Homarus
americanus, showing the pancrustacean ground pattern. Here, we present the complete
mitogenome sequence of I. ciliatus; it is the first mitogenome information from the subfamily
Ibacinae, and represents the second for the family Scyllaridae.